Malicious PDF — malware analysis report

Static analysis result for SHA-256 00dcc130b3f47dc5…

MALICIOUS

PDF

89.6 KB Created: 2021-06-27 11:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ef01a3fb3713b0b886309b86d8d9076 SHA-1: 5d239ee08ee747c1c01d61ba6c016802b339e113 SHA-256: 00dcc130b3f47dc5bfe936215b50b5eaa798477535c9066f66708706c3e945d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/uplcv?utm_term=meaning+of+slags
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0ebd7446---64069823279.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160844f4a368f1---tasalu.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086bcebc2b8b---74027608374.pdf
    • http://diysmart.net/userfiles/file/pajegiramepegijulureme.pdf
    • http://diclenakliyat.com/userfiles/file/liwejujutegatejuzaxixe.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/e62cmrackm064of2mj7urqqddq/17270629272.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609279a4cdb53---13269733453.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094de9d41b18---dovavubewoxawokedomub.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/cc1a9aee3afe70c791144e64ec8ae9d4/zojanegiwefit.pdf
    • https://alianzatours.com/imagenes/file/rigatiworizodekevuvodadi.pdf
    • https://cbdc.co/uploads/ckfinder/userfiles/files/54658578939.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c3a8696e---lijojubojumajeko.pdf
    • http://vansuloi.com/uploads/userfiles/file/57702279197.pdf
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/27469102007.pdf
    • http://cupta.org/userfiles/files/20210623054301.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e8cbd16d1---potomesepalonugalowaxox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f56a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 16792 bytes
font_01_sfnt_off00010d7c.bin
9d682a001a6fbcf2aa01397bd9b1572384c72ac320b989e7ff8605e20236c2a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 20392 bytes
font_02_sfnt_off000141b8.bin
25c11c8968fe884081634511eec238d5d6edf71a76756becce804595da45e07e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141B8 10184 bytes

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